refactor: consolidate #![allow(clippy::cast_*)] to crate roots

Add the cast-allow block to zesdex-entities/src/lib.rs and
zesdex-utils/src/lib.rs (which lacked it), then remove from
65 sub-files across all 8 crates. Build and all 223 tests
continue to pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/zesdex-entities/src/domain/auth/session.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Session metadata: id, title, workspace roots, and message/token counts,
 //! persisted as `session.json` per session directory.
 use chrono::Utc;

crates/zesdex-entities/src/domain/auth/session_lock.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! PID-file based advisory lock preventing two processes from operating on
 //! the same session directory concurrently.
 use std::fs;

crates/zesdex-entities/src/domain/common/conversation.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! In-memory conversation state: message history plus the system prompt and
 //! model parameters used to drive the LLM.
 use serde::{Deserialize, Serialize};

crates/zesdex-entities/src/domain/common/message.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Chat message types shared across the entity layer: `Role` and `ChatMessage`
 //! with convenience constructors.
 use serde::{Deserialize, Serialize};

crates/zesdex-entities/src/domain/common/provider.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Provider-facing DTOs: chat completion request, response, streaming types,
 //! and the SSE stream parser.
 use serde::{Deserialize, Serialize};

crates/zesdex-entities/src/domain/common/store.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Filesystem layout for zesdex's persistent and scratch data directories.
 use serde::{Deserialize, Serialize};
 use std::path::PathBuf;

crates/zesdex-entities/src/domain/common/tool_call.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Tool-call DTOs embedded in assistant chat messages.
 //!
 //! Flow: provider response/stream carries `tool_calls` on an assistant

crates/zesdex-entities/src/domain/common/tool_result.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Record of one completed tool invocation, kept for transcript/history.
 use serde::{Deserialize, Serialize};
 

crates/zesdex-entities/src/domain/common/usage.rs

@@ -1,9 +1,3 @@
-#![allow(
-    clippy::cast_possible_truncation,
-    clippy::cast_sign_loss,
-    clippy::cast_precision_loss,
-    clippy::cast_possible_wrap
-)]
 //! Token usage accounting shared by streaming and non-streaming responses.
 use serde::{Deserialize, Serialize};
 

crates/zesdex-entities/src/lib.rs

@@ -1,3 +1,10 @@
+#![allow(
+    clippy::cast_possible_truncation,
+    clippy::cast_sign_loss,
+    clippy::cast_precision_loss,
+    clippy::cast_possible_wrap
+)]
+
 //! Domain entity types for the Zesdex application.
 //!
 //! This crate contains ALL domain entity types as pure data structures